younger sisters
definitions
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female siblings who are younger in age than the person or group being referred to.ru: младшие сёстры
examples
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Elizabeth and Jane spent their days reading and walking together, and their younger sisters seemed to be on their best behaviour.
Элизабет и Джейн проводили свои дни за чтением и прогулками, и их младшие сестры, казалось, вели себя очень прилежно.